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SDS-PAGE analysis of Φ1 74 particles. A 20% polyacryl-amide gel with 0.5% cross-linking agent was run in 0.75 M Tris-HCI (pH 9.3) buffer with 10% glycerol. The gel was loaded with virions in lane a, procapsids in lane b and provirions in lane c. Protein B migrates abnormally slowly under these conditions in an SDS gel [6].
